Table 1.

Oswestry Disability Index percentage scores preoperatively and at 6 weeks and 1 year postoperatively

	n	Preop	6 weeks postop	1 year postop	6 weeks mean reduction (CI)	P value	1 year mean reduction (CI)	P value
All	119	44.82	25.13	28.39	19.69 (16.24–23.15)	<0.0001	16.43 (12.66–20.22)	<0.0001
Gender
Male	49	43.27	26.16	29.39	17.11 (11.59–22.62)	<0.0001	13.88 (7.83–19.93)	<0.0001
Female	70	45.91	24.4	27.69	21.51 (16.2–26.83)	<0.0001	18.22 (12.68–23.78)	<0.0001
Operation
Laminectomy	63	47.40	23.02	27.24	24.38 (18.37–30.39)	<0.0001	20.16 (13.67–26.64)	<0.0001
Laminotomy	56	41.93	27.5	29.68	14.43 (8.18–20.67)	<0.0001	12.25 (5.83–18.67)	<0.0003
Indication
Central stenosis	95	45.62	24.88	28.78	20.74 (16.02–25.46)	<0.0001	16.84 (11.82–21.87)	<0.0001
Lateral recess stenosis	24	41.67	26.08	26.83	15.59 (4.53–26.64)	0.0068	14.84 (3.66–26.01)	0.0104